pef vs dng

Godfrey, Mark and Graydon wrote some very good comments on archiving
automation and efficiency. My comment below.
The boy asked: Dad, dad, what's the difference between theory and practice?
The father replied: Well... you know... mom welcomes men quite often, and
your dear sister has also started doing that... in theory, we should get a
lot of money... in practice we have two bitches at home.
Dario